Mr. Bloomberg to Take Control of Company at End of This Year

Less than a year after leaving office as mayor of New York City, Michael Bloomberg will return as head of Bloomberg LP, the financial data and media firm he founded and still controls, the company announced Wednesday.

Mr. Bloomberg, 72 years old, will take charge at the end of the year, when Daniel Doctoroff, who has been chief executive since 2008, will step aside, the company said.